* Establishes an optimal mineral balance in water that has been purified (e.g. reverse osmosis, deionization, etc.) or is exceedingly-soft (e.g. well water in forested regions) for all freshwater community aquaria, as well as for freshwater biotope aquaria housing fishes indigenous to forested and/or riverine habitats. * Provides a beneficial ratio of potassium, calcium, magnesium, and sodium, elements which are vital to the overall health and osmoregulation of fishes, invertebrates, and many aquatic plants. * May be used to establish water parameters conducive to the husbandry of freshwater fishes, plants, and invertebrates in aquaria filled with purified water, to replenish depleted elemental concentrations in aquaria that rarely receive a water change, and to re-establish beneficial mineral concentrations in aquaria following large water changes.